scholarly journals CCD Sounding Rocket Observation of the High‐Latitude Soft X‐Ray Background

2001 ◽  
Vol 563 (2) ◽  
pp. 716-723 ◽  
Author(s):  
J. A. Mendenhall ◽  
D. N. Burrows
Keyword(s):  
High Latitude ◽  
Sounding Rocket ◽  
X Ray ◽  
X Ray Background

scholarly journals UHURU Results on Extragalactic X-Ray Sources

1973 ◽  
Vol 55 ◽  
pp. 171-183 ◽  
Author(s):  
Edwin M. Kellogg
Keyword(s):  
High Latitude ◽  
Luminosity Function ◽  
Optical Data ◽  
Clusters Of Galaxies ◽  
X Rays ◽  
Total Contribution ◽  
X Ray ◽  
Normal Galaxies ◽  
X Ray Background ◽  
Individual Galaxies

Data from the UHURU satellite have provided a list of more than forty high latitude sources (|b| > 20°). X-rays have been detected from among the nearest normal galaxies, giant radio galaxies, Seyferts, QSOs and clusters of galaxies. The cluster sources appear to be extended by several hundred kiloparsecs as well as being very luminous. These cluster sources have systematic differences in their X-ray spectra from individual galaxies.About twenty sources are not reliably identified so far. A few of these are located near undistinguished 3C or MSH radio sources. The rest are either located near distant clusters or undistinguished bright galaxies, or are too far south, so that we have not sufficient optical data to allow a thorough search for possible association with clusters or unusual individual galaxies.The luminosity function for weak, high latitude X-ray sources is determined, and the contribution of sources just below the UHURU threshold of detectability to observed fluctuations in the diffuse X-ray background is evaluated. The total contribution of all observed types of extragalactic sources to the X-ray background is estimated.

Ariel results on extragalactic X-ray sources

1976 ◽  
Vol 350 (1663) ◽  
pp. 491-503 ◽  
Keyword(s):  
High Latitude ◽  
Field Of View ◽  
Potential Contribution ◽  
Galactic Latitude ◽  
Survey Experiment ◽  
Spectral Measurements ◽  
High Galactic Latitude ◽  
X Ray ◽  
X Ray Background ◽  
The University

Two of the instruments on Ariel 5 are designed to study the weak high galactic latitude X-ray sources, a number of which have been identified with extragalactic objects. The survey experiment of the University of Leicester has detected sources with strengths down to 2-3 Uhuru counts. Several high latitude sources catalogued by Uhuru have apparently dropped in intensity below this level and improved positions have been obtained for other high latitude sources which support the tentative identification with optical counterparts. The pointed instrument from M. S. S. L. has a programme of spectral measurements of identified extragalactic and other weak sources at high galactic latitudes. The field of view of the M. S. S. L. experiment makes the instrument well suited to the study of the diffuse X-ray background. Results are presented from both experiments on a number of the extragalactic sources and, in particular, discussed in relation to their potential contribution to the diffuse X-ray background. Preliminary measurements of the diffuse X-ray background by the M. S. S. L. instruments are presented.

CCD sounding rocket observations of the soft x-ray background

1996 ◽  
Author(s):  
Jeffrey A. Mendenhall ◽  
David N. Burrows ◽  
Laura J. Cawley ◽  
Eric J. Cocklin ◽  
Gordon P. Garmire ◽  
...  
Keyword(s):  
Sounding Rocket ◽  
X Ray ◽  
X Ray Background

scholarly journals Ultrasoft X-Ray Background Observations of the Local Interstellar Medium

1984 ◽  
Vol 81 ◽  
pp. 222-225 ◽  
Author(s):  
W.T. Sanders ◽  
S.L. Snowden ◽  
J.J. Bloch ◽  
M. Juda ◽  
K.M. Jahoda ◽  
...  
Keyword(s):  
Interstellar Medium ◽  
Energy Band ◽  
Mean Free Path ◽  
Sounding Rocket ◽  
X Rays ◽  
Local Interstellar Medium ◽  
Peak Response ◽  
X Ray ◽  
Band Emission ◽  
X Ray Background

Preliminary results from a May 8, 1984 sounding rocket survey of the soft X-ray background are presented. The X-ray detectors are sensitive to X-rays in three soft X-ray bandpasses: 80-110 eV, 90-188 eV, and 284-532 eV (at 20% of peak response). The lowest energy X-rays in this range have a mean free path of order 1019 cm-2 and provide information about the local interstellar medium. The count rate in the 80-110 eV energy band (the Be band) tracks the 90-188 eV band (the B band) very well, indicating that the same ~1 million degree gas that is responsible for the B band emission may be responsible for the bulk of the Be band X-rays as well. We estimate for the flux in the Be band ~1 photon cm-2 s-1 sr-1 eV-1 , about a factor of four lower than that found by Stern and Bowyer (1979) and Paresce and Stern (1981) over a similar energy band.

High-latitude H I structure and the soft X-ray background

1985 ◽  
Vol 290 ◽  
pp. 229 ◽  
Author(s):  
K. Jahoda ◽  
D. McCammon ◽  
J. M. Dickey ◽  
F. J. Lockman
Keyword(s):  
High Latitude ◽  
X Ray ◽  
X Ray Background

Observed and Theoretical Spectra in the 10–100Å Interval

1988 ◽  
Vol 102 ◽  
pp. 259-261
Author(s):  
W.A. Brown ◽  
M.E. Bruner ◽  
L.W. Acton
Keyword(s):  
Sounding Rocket ◽  
Full Spectrum ◽  
X Ray

AbstractThe soft x-ray spectra recorded in two sounding rocket flights in 1982 and 1985 are compared with with predicted spectra. The poster presents the processed densitometer trace of the full spectrum together with the new spectrum from the 1985 experiment. This note compares the intensities of the lines with predictions.

scholarly journals The unified Seyfert scheme and the origin of the cosmic X-ray background

1994 ◽  
Vol 270 (1) ◽  
pp. L17-L21 ◽  
Author(s):  
P. Madau ◽  
G. Ghisellini ◽  
A. C. Fabian
Keyword(s):  
X Ray ◽  
X Ray Background

scholarly journals The X-ray background and the deep X-ray surveys

2004 ◽  
Vol 34 (12) ◽  
pp. 2470-2477 ◽  
Author(s):  
R. Gilli
Keyword(s):  
X Ray ◽  
X Ray Background
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